S-91247A897 7/8"-9 x 6 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 120,000 psi tensile strength and Grade 5 classification for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in industrial environments
• Optimized thread engagement with 7/8"-9 UNC coarse threads providing enhanced grip and vibration resistance
• Precise mechanical compatibility through Class 2A thread fit ensuring consistent assembly and interchangeability
• Robust structural integrity backed by Rockwell C25 hardness for durability under repeated stress
• Efficient installation with external hex drive design allowing high-torque application using standard tools
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

This heavy-duty hex head screw delivers critical engineering solutions where structural integrity matters most. The Grade 5 steel construction combined with zinc plating creates a fastener capable of withstanding harsh industrial conditions while resisting corrosion. The 7/8"-9 UNC coarse thread configuration provides superior holding power in soft materials and faster installation in production environments. With partial threading and external hex drive, this screw offers optimal clamp load distribution while enabling high-torque applications in construction, machinery assembly, and structural framing. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance in vibration-prone applications, making it ideal for heavy equipment, industrial machinery, and structural connections where failure is not an option.

Specification Summary & Compliance

Manufactured to Class 2A thread fit tolerances with 7/8"-9 UNC coarse threads in right-hand direction. Complies with ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety. Features partial threading with minimum 2 1/4" thread length and overall 6 1/2" length in inch system measurements.